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Survival fraction of A549 cells was suppressed following irradiation by micro ribonucleic acid (miR)‐451 overexpression. Clonogenicity was evaluated by Giemsa staining and presented as the percentage of colonies formed in A549 cells treated with irradiation and transfected with pre‐miR‐451 or scrambled control relative to untreated cells. Each value represents the mean ± standard deviation of three independent experiments. 
, scrambled; 
, pre‐miR‐451.
